<template>
  <div class="swiper-container" ref="swiper">
    <div class="swiper-wrapper">
      <!--swiper滑屏页-->
      <div class="swiper-slide" v-for="(skuImage,index) in skuImageList" :key="skuImage.id">
        <img :src="skuImage.imgUrl"  @click="changeCurrentIndex(index)"
             :class="{active:currentIndex===index}">
      </div>
    </div>
    <div class="swiper-button-next"></div>
    <div class="swiper-button-prev"></div>
  </div>
</template>

<script>
  import Swiper from "swiper/swiper-bundle.min.js";
  import {mapGetters} from "vuex";
  export default {
    name: "ImageList",
    data(){
      return {
          //代表当前哪张图片该被选中
          currentIndex:0
      }
    },
    methods:{
        changeCurrentIndex(index){
            this.currentIndex = index;
            //触发总线的事件 将index传递给Zoom.vue
            this.$bus.$emit("getIndexForZoom",index)
        }
    },
    computed:{
        ...mapGetters(["skuImageList"])
    },
    watch:{
        skuImageList:{
            handler(val){
                if(val.length<=0) return;
                this.$nextTick(()=>{
                    //真正的轮播逻辑
                    new Swiper (this.$refs.swiper, {
                        direction: 'horizontal', // 水平切换选项
                        //loop: true, // 循环模式选项
                        slidesPerView:5, //控制整个容器中显示多少个轮播页
                        slidesPerGroup:2,//每次轮播 滚动多少屏
                        // 如果需要前进后退按钮
                        navigation: {
                            nextEl: '.swiper-button-next',
                            prevEl: '.swiper-button-prev',
                        }
                    })
                })
            },
            deep:true,
            immediate: true
        }
    }
  }
</script>

<style lang="less" scoped>
  .swiper-container {
    height: 56px;
    width: 412px;
    box-sizing: border-box;
    padding: 0 12px;

    .swiper-slide {
      width: 56px;
      height: 56px;

      img {
        width: 100%;
        height: 100%;
        border: 1px solid #ccc;
        padding: 2px;
        width: 50px;
        height: 50px;
        display: block;
        margin: 0 auto;

        &.active {
          border: 2px solid #f60;
          padding: 1px;
        }

        &:hover {
          border: 2px solid #f60;
          padding: 1px;
        }
      }
    }

    .swiper-button-next {
      left: auto;
      right: 0;
    }

    .swiper-button-prev {
      left: 0;
      right: auto;
    }

    .swiper-button-next,
    .swiper-button-prev {
      box-sizing: border-box;
      width: 12px;
      height: 56px;
      background: rgb(235, 235, 235);
      border: 1px solid rgb(204, 204, 204);
      top: 0;
      margin-top: 0;
      &::after {
        font-size: 12px;
      }
    }
  }
</style>